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Templates

Posted on 2004-04-19
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I am not understanding the concept of templates. In my program I have a customer class truck class and contract class. I am not getting an idea how to templates for this. take the class roughly as below
class customer                class truck                                                    class contract
{                                   {                                                                  {
private:                           private:                                                        private:
  char* Name;                    enum truck{ford, toyota, Benz};                     int No_of_months;
  int age;                            int truc_milage;                                            DATE start_date;
public:                            public:                                                          public:  
 getage();                          get_trucktype();                                            get_contractdate();  
 setage();                          get_milage();                                                get_No_ofmonths();
};                                  };                                                                 };
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Question by:rmvprasad
4 Comments
 
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Expert Comment

by:Axter
ID: 10866220
What makes you think you need a template?
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Sys_Prog earned 40 total points
ID: 10866221
Templates is a mechanism to have parametrised classes

For example, if u have a class Complex representing Complex Numbers & has various operations defined on it, u could simply write this way

class Complex {
       int real ;
       int im ;
       public :
           Complex ( int re = 0 ; int im1 = 0 ) : real ( re ) , im ( im1 ) {}
           ...
            ....
} ;

But in this case, u can have complex numbers with real and imaginary parts being int
If u want a float version fo COmplex number class, u will have to rewrite it for float with some other name
Instead u could create a Template class which accepts the type as parameter

template <class Real, class Imag>
class Complex {
       Real real ;
       Imag im ;
       public :
         Complex ( Real re1, Imag im1 ) : real ( re ), im  ( im1 ) {} ;
   ..
 ..
};

int main ( ) {
      Complex <int, float> c ;
       Complex <int, int> c ;
       Complex <double, int> c ;
}
 
amit
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Author Comment

by:rmvprasad
ID: 10866298
I am told to do so. My doubt is in this design of multiclasses should I write a template for each class or can it be done for a group of classes. If so how. If not then how to decide to which classes templates have to be applied. Please explain that.
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Expert Comment

by:Tomas Helgi Johannsson
ID: 10867029
It can and should be done for group of classes with the same amount of functions and functionality.
If you have 2 classes and both of them has 2 functions that return integer and string then you can write
a TEMPLATE class for them.

Regards,
  Tomas Helgi
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